vim.fn.sort() called in fast event context -> E5560 when notify is triggered from fast event

[vidhatre]

When fidget.notification.notify() is triggered from a fast event (e.g., project.nvim history read), fidget calls vim.fn.sort() in notification/model.lua, which raises:

E5560: Vimscript function "sort" must not be called in a fast event context

To Reproduce

1. Install fidget.nvim and project.nvim via lazy.nvim
2. Use default config (or enable project.nvim history)
3. Trigger a project history read (e.g., opening Neovim in a repo with project history enabled)
4. Observe error in :messages

Actual Behavior

Error thrown from fidget/notification/model.lua:270 (stack trace below).

Expected Behavior

Notifications should be safe even when triggered from fast events. fidget should avoid Vimscript calls in fast event context or schedule the update.

Stack trace

Error executing callback:
.../nvim/lazy/fidget.nvim/lua/fidget/notification/model.lua:270: E5560: Vimscript function "sort" must not be called in a fast event context
stack traceback:
[C]: in function 'sort'
.../nvim/lazy/fidget.nvim/lua/fidget/notification/model.lua:270: in function 'update'
.../share/nvim/lazy/fidget.nvim/lua/fidget/notification.lua:307: in function 'notify'
...hare/nvim/lazy/project.nvim/lua/project/util/history.lua:421: in function 'read_history'
...hare/nvim/lazy/project.nvim/lua/project/util/history.lua:385: in function <...hare/nvim/lazy/project.nvim/lua/project/util/history.lua:380>

Relevant code

In lua/fidget/notification/model.lua:

-- NOTE: we use vim.fn.sort() here because it is stable.
state.groups = vim.fn.sort(state.groups, function(a, b)
  return (a.config.priority or 50) - (b.config.priority or 50)
end)

## Proposed fix

- Option 1: schedule notification.notify() or model.update() path with vim.schedule() when in fast event context.
- Option 2: replace vim.fn.sort() with a Lua stable sort implementation (avoids Vimscript calls in fast events).

## Workaround

User-side wrapper:

local ok, notif = pcall(require, "fidget.notification")
if ok then
  local orig = notif.notify
  notif.notify = function(msg, level, opts)
    vim.schedule(function()
      orig(msg, level, opts)
    end)
  end
end

## Environment

- OS: SUSE Linux Enterprise Server 15 SP4
- Neovim:  v0.11.5
- fidget.nvim: commit:7fa433a
- project.nvim: commit:379f79a, https://github.com/DrKJeff16/project.nvim

---
Discalaimer: I used AI to help diagnose and build the wrapper.

[nqrk]

Hi, couldn't reproduce the issue using project.nvim..

But triggering fast event on vim.notify indeed trigger E5560:

  t:start(1, 0, function() vim.notify("foo") end)

Opened a PR for this 👍